xjasonlyu/tun2socks

//go:build !windows

package fdbased

import (
    "fmt"
    "strconv"

    "golang.org/x/sys/unix"
    "gvisor.dev/gvisor/pkg/tcpip/stack"

    "github.com/xjasonlyu/tun2socks/v2/core/device"
)

const defaultMTU = 1500

type FD struct {
    stack.LinkEndpoint

    fd  int
    mtu uint32
}

func Open(name string, mtu uint32, offset int) (device.Device, error) {
    fd, err := strconv.Atoi(name)
    if err != nil {
        return nil, fmt.Errorf("cannot open fd: %s", name)
    }
    if mtu == 0 {
        mtu = defaultMTU
    }
    return open(fd, mtu, offset)
}

func (f *FD) Type() string {
    return Driver
}

func (f *FD) Name() string {
    return strconv.Itoa(f.fd)
}

func (f *FD) Close() error {
    return unix.Close(f.fd)
}

var _ device.Device = (*FD)(nil)